水电站进水塔结构抗震性能评估

水电站泄洪洞进水塔作为地下隧洞的首部结构,其安全性关系到整个水电站的安全和效益。采用大型三维有限元程序ANSYS对某水电站泄洪洞进水塔结构进行了抗震分析,计算分析了进水塔结构的自振特性,通过反应谱法计算了在顺水流方向、垂直水流方向和竖直方向地震共同作用下进水塔结构的动位移、动应力分布等动力响应情况,并将动力计算结果与静力计算结果进行叠加,评估了进水塔结构抗震性能。结果表明,进水塔结构的变形与强度均能满足要求,但其抗震薄弱部位应力较大,在结构设计时需采取特殊措施以确保塔体结构的安全。

Aseismatic Evaluation of Intake Tower Structure of Hydropower Station

Intake tower of flood discharging tunnel is the head structure of underground tunnel in a hydropower station. Its safety is very important in the security and benefit of hydropower station. The aseismatic analysis of intake tower in hydropower station is performed with 3D FEM program ANSYS software. And the natural vibration characteristics of intake tower structure are analyzed. Under the earthquake interaction in forward flow, vertical flow and vertical direction, dynamic response of displacement and stress distribution are calculated by using response spectrum method. By superimposing the results of dynamic and static calculation, the aseismatic behavior of intake tower is evaluated. The result shows that the deformation and intensity of intake tower structure meet requirements; however, the stress is very high in the weakness aseismatic region, where special measures should be taken to ensure the safety of the tower structure.